Valis III (ヴァリスⅢ Varisu Surī?) is an action-platformer video game developed by Telenet Japan and originally released for the PC Engine Super CD-ROM² on September 7, 1990 in Japan. It was later released for the Sega Mega Drive/Genesis in 1991 both in Japan and North America, and for the TurboGrafx-CD in 1992 in North America. It is the third game in the Mugen Senshi Valis series and once again features Yūko Asou (麻生 優子 Asou Yūko?) as the lead character. She is also joined by her twin sister, Valna, and a young Vecanti warrior named Cham who are playable characters.
Somewhere in the Dark World, evil rears its ugly head once again...
A black-hearted man named Glames, possessor of a sword named Leethus, threatens the Human World, the Dream World, and the Dark World with complete and utter destruction. A young girl from the Dark World named Cham escapes from Glames, and seeks help to destroy him.
She comes to the Human World, searching for the Valis Warrior, Yūko Asou, and more importantly, the Valis Sword.
Yuko must now help Cham defeat Glames before the three worlds are torn apart.
New improvements over the previous two Valis games include 3 playable characters, 3 unique weapons for each character, and greater, more powerful magic spells.